{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2022:AMNS7NSPHEAN2B4HLI4ATOPD6I","short_pith_number":"pith:AMNS7NSP","canonical_record":{"source":{"id":"2204.10252","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2022-04-21T16:38:41Z","cross_cats_sorted":[],"title_canon_sha256":"bfd6b4fdbd9161cc517c00c4642349e68338ca3eea4293aab10d79566b09f052","abstract_canon_sha256":"4864e74a814e18acaa7658206f5162d858a5c2d82eee2106f2d576659a96da1f"},"schema_version":"1.0"},"canonical_sha256":"031b2fb64f3900dd07875a3809b9e3f20f78f70b286b76837772df4c47c77cab","source":{"kind":"arxiv","id":"2204.10252","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2204.10252","created_at":"2026-07-05T05:00:41Z"},{"alias_kind":"arxiv_version","alias_value":"2204.10252v3","created_at":"2026-07-05T05:00:41Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2204.10252","created_at":"2026-07-05T05:00:41Z"},{"alias_kind":"pith_short_12","alias_value":"AMNS7NSPHEAN","created_at":"2026-07-05T05:00:41Z"},{"alias_kind":"pith_short_16","alias_value":"AMNS7NSPHEAN2B4H","created_at":"2026-07-05T05:00:41Z"},{"alias_kind":"pith_short_8","alias_value":"AMNS7NSP","created_at":"2026-07-05T05:00:41Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2022:AMNS7NSPHEAN2B4HLI4ATOPD6I","target":"record","payload":{"canonical_record":{"source":{"id":"2204.10252","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2022-04-21T16:38:41Z","cross_cats_sorted":[],"title_canon_sha256":"bfd6b4fdbd9161cc517c00c4642349e68338ca3eea4293aab10d79566b09f052","abstract_canon_sha256":"4864e74a814e18acaa7658206f5162d858a5c2d82eee2106f2d576659a96da1f"},"schema_version":"1.0"},"canonical_sha256":"031b2fb64f3900dd07875a3809b9e3f20f78f70b286b76837772df4c47c77cab","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T05:00:41.739471Z","signature_b64":"P+VJFdrek9Ue3VE7R4ecs4btl9eGck/eK3XUqvOyBhTsvOjuv0v935clx4Bydv3wOIGj7fohXZUB9F8F/4wPAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"031b2fb64f3900dd07875a3809b9e3f20f78f70b286b76837772df4c47c77cab","last_reissued_at":"2026-07-05T05:00:41.738904Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T05:00:41.738904Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2204.10252","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T05:00:41Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"YLJhh4fnEXj5pEh8HYzU7pPyBJEAgGepEF/M6UTqguxIrQlXrL/DGXxmXU2EFqYYdgffNR+QXrqtMuV0Pc4IBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-04T16:22:57.109718Z"},"content_sha256":"1eb7ef49311889416f112ff174fedce5bc594ee2e4ded7e3472bdb47e4e96799","schema_version":"1.0","event_id":"sha256:1eb7ef49311889416f112ff174fedce5bc594ee2e4ded7e3472bdb47e4e96799"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2022:AMNS7NSPHEAN2B4HLI4ATOPD6I","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Polynomial Preconditioners for Regularized Linear Inverse Problems","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.med-ph","authors_text":"Congyu Liao, Frank Ong, Jonathan I. Tamir, Kawin Setsompop, Luca Daniel, Siddharth Srinivasan Iyer, Xiaozhi Cao","submitted_at":"2022-04-21T16:38:41Z","abstract_excerpt":"This work aims to accelerate the convergence of proximal gradient methods used to solve regularized linear inverse problems. This is achieved by designing a polynomial-based preconditioner that targets the eigenvalue spectrum of the normal operator derived from the linear operator. The preconditioner does not assume any explicit structure on the linear function and thus can be deployed in diverse applications of interest. The efficacy of the preconditioner is validated on three different Magnetic Resonance Imaging applications, where it is seen to achieve faster iterative convergence while ach"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2204.10252","kind":"arxiv","version":3},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2204.10252/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T05:00:41Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"BEbC+cDQmbnebesFJYiRIhzCCpMpwmQEYH8XVIUA2zl2gX9pnB86l38X+zB7xqvyw23AJzbYFB3sm0J78waCDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-04T16:22:57.110646Z"},"content_sha256":"3eb968cd53cf3df8fee4a1cce3a86932b30fd8c93910034449742fb7b0d135e8","schema_version":"1.0","event_id":"sha256:3eb968cd53cf3df8fee4a1cce3a86932b30fd8c93910034449742fb7b0d135e8"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/AMNS7NSPHEAN2B4HLI4ATOPD6I/bundle.json","state_url":"https://pith.science/pith/AMNS7NSPHEAN2B4HLI4ATOPD6I/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/AMNS7NSPHEAN2B4HLI4ATOPD6I/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-08-04T16:22:57Z","links":{"resolver":"https://pith.science/pith/AMNS7NSPHEAN2B4HLI4ATOPD6I","bundle":"https://pith.science/pith/AMNS7NSPHEAN2B4HLI4ATOPD6I/bundle.json","state":"https://pith.science/pith/AMNS7NSPHEAN2B4HLI4ATOPD6I/state.json","well_known_bundle":"https://pith.science/.well-known/pith/AMNS7NSPHEAN2B4HLI4ATOPD6I/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2022:AMNS7NSPHEAN2B4HLI4ATOPD6I","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"4864e74a814e18acaa7658206f5162d858a5c2d82eee2106f2d576659a96da1f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2022-04-21T16:38:41Z","title_canon_sha256":"bfd6b4fdbd9161cc517c00c4642349e68338ca3eea4293aab10d79566b09f052"},"schema_version":"1.0","source":{"id":"2204.10252","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2204.10252","created_at":"2026-07-05T05:00:41Z"},{"alias_kind":"arxiv_version","alias_value":"2204.10252v3","created_at":"2026-07-05T05:00:41Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2204.10252","created_at":"2026-07-05T05:00:41Z"},{"alias_kind":"pith_short_12","alias_value":"AMNS7NSPHEAN","created_at":"2026-07-05T05:00:41Z"},{"alias_kind":"pith_short_16","alias_value":"AMNS7NSPHEAN2B4H","created_at":"2026-07-05T05:00:41Z"},{"alias_kind":"pith_short_8","alias_value":"AMNS7NSP","created_at":"2026-07-05T05:00:41Z"}],"graph_snapshots":[{"event_id":"sha256:3eb968cd53cf3df8fee4a1cce3a86932b30fd8c93910034449742fb7b0d135e8","target":"graph","created_at":"2026-07-05T05:00:41Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2204.10252/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"This work aims to accelerate the convergence of proximal gradient methods used to solve regularized linear inverse problems. This is achieved by designing a polynomial-based preconditioner that targets the eigenvalue spectrum of the normal operator derived from the linear operator. The preconditioner does not assume any explicit structure on the linear function and thus can be deployed in diverse applications of interest. The efficacy of the preconditioner is validated on three different Magnetic Resonance Imaging applications, where it is seen to achieve faster iterative convergence while ach","authors_text":"Congyu Liao, Frank Ong, Jonathan I. Tamir, Kawin Setsompop, Luca Daniel, Siddharth Srinivasan Iyer, Xiaozhi Cao","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2022-04-21T16:38:41Z","title":"Polynomial Preconditioners for Regularized Linear Inverse Problems"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2204.10252","kind":"arxiv","version":3},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:1eb7ef49311889416f112ff174fedce5bc594ee2e4ded7e3472bdb47e4e96799","target":"record","created_at":"2026-07-05T05:00:41Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"4864e74a814e18acaa7658206f5162d858a5c2d82eee2106f2d576659a96da1f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.med-ph","submitted_at":"2022-04-21T16:38:41Z","title_canon_sha256":"bfd6b4fdbd9161cc517c00c4642349e68338ca3eea4293aab10d79566b09f052"},"schema_version":"1.0","source":{"id":"2204.10252","kind":"arxiv","version":3}},"canonical_sha256":"031b2fb64f3900dd07875a3809b9e3f20f78f70b286b76837772df4c47c77cab","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"031b2fb64f3900dd07875a3809b9e3f20f78f70b286b76837772df4c47c77cab","first_computed_at":"2026-07-05T05:00:41.738904Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T05:00:41.738904Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"P+VJFdrek9Ue3VE7R4ecs4btl9eGck/eK3XUqvOyBhTsvOjuv0v935clx4Bydv3wOIGj7fohXZUB9F8F/4wPAQ==","signature_status":"signed_v1","signed_at":"2026-07-05T05:00:41.739471Z","signed_message":"canonical_sha256_bytes"},"source_id":"2204.10252","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1eb7ef49311889416f112ff174fedce5bc594ee2e4ded7e3472bdb47e4e96799","sha256:3eb968cd53cf3df8fee4a1cce3a86932b30fd8c93910034449742fb7b0d135e8"],"state_sha256":"eec59663501b405cce5759ad6ef24cf5fe66d0fa785cca1ac8961ca4550e2b01"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"clgNtoXFPIIeHjc6O115KIOD8b8TTRVmHXaoBeIpFkwoJtvMKalsWj6xpfCctnUAWlqJkMW1ApqchYMSGbLNDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-04T16:22:57.191556Z","bundle_sha256":"af578f35963b901a11905aab4e8188cad7533c6221432c1d8b5d1a2fabb60703"}}